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<li class="toctree-l3"><a class="reference internal" href="#gslab_make.move_sources.link_externals"><code class="docutils literal notranslate"><span class="pre">link_externals()</span></code></a></li>
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  <section id="link-externals">
<h1>link_externals<a class="headerlink" href="#link-externals" title="Permalink to this heading"></a></h1>
<dl class="py function">
<dt class="sig sig-object py" id="gslab_make.move_sources.link_externals">
<span class="sig-name descname"><span class="pre">link_externals</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">paths</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">file_list</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#gslab_make.move_sources.link_externals" title="Permalink to this definition"></a></dt>
<dd><p>Create symbolic links using instructions contained in files of list <code class="docutils literal notranslate"><span class="pre">file_list</span></code>.
Instructions are <a class="reference external" href="https://docs.python.org/3.4/library/string.html#format-string-syntax">string formatted</a>
using paths dictionary <code class="docutils literal notranslate"><span class="pre">paths</span></code>. Symbolic links are written in directory <code class="docutils literal notranslate"><span class="pre">external_dir</span></code>.
Status messages are appended to file <code class="docutils literal notranslate"><span class="pre">makelog</span></code>.</p>
<p>Instruction files on how to create symbolic links (destinations) from targets (sources)
should be formatted in the following way.</p>
<div class="highlight-md notranslate"><div class="highlight"><pre><span></span><span class="gh"># Each line of instruction should contain a destination and source delimited by a `|`</span>
<span class="gh"># Lines beginning with # are ignored</span>
destination | source
</pre></div>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Symbolic links can be created to both files and directories.</p>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Instruction files can be specified with the * shell pattern
(see <a class="reference external" href="https://www.gnu.org/software/findutils/manual/html_node/find_html/Shell-Pattern-Matching.html">here</a>).
Destinations and their sources can also be specified with the * shell pattern.
The number of wildcards must be the same for both destinations and sources.</p>
</div>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>paths</strong> (<em>dict</em>) – Dictionary of paths. Dictionary should contain values for all keys listed below.
Dictionary additionally used to string format linking instructions.</p></li>
<li><p><strong>file_list</strong> (<em>str</em><em>, </em><em>list</em>) – File or list of files containing linking instructions.</p></li>
</ul>
</dd>
<dt class="field-even">Path Keys<span class="colon">:</span></dt>
<dd class="field-even"><ul class="simple">
<li><p><strong>external_dir</strong> (<em>str</em>) – Directory to write symlinks.</p></li>
<li><p><strong>makelog</strong> (<em>str</em>) – Path of makelog.</p></li>
</ul>
</dd>
<dt class="field-odd">Returns<span class="colon">:</span></dt>
<dd class="field-odd"><p><strong>source_map</strong> – List of (source, destination) for each symlink created.</p>
</dd>
<dt class="field-even">Return type<span class="colon">:</span></dt>
<dd class="field-even"><p>list</p>
</dd>
</dl>
<p class="rubric">Example</p>
<p>Suppose you call the following function.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">link_externals</span><span class="p">(</span><span class="n">paths</span><span class="p">,</span> <span class="p">[</span><span class="s1">&#39;file1&#39;</span><span class="p">],</span> <span class="n">formatting_dict</span><span class="p">)</span>
</pre></div>
</div>
<p>Suppose <code class="docutils literal notranslate"><span class="pre">paths</span></code> contained the following values.</p>
<div class="highlight-md notranslate"><div class="highlight"><pre><span></span>paths = {&#39;root&#39;: &#39;/User/root/&#39;,
         &#39;makelog&#39;: &#39;make.log&#39;,
         &#39;input_dir&#39;: &#39;input&#39;}
</pre></div>
</div>
<p>Now suppose instruction file <code class="docutils literal notranslate"><span class="pre">file1</span></code> contained the following text.</p>
<div class="highlight-md notranslate"><div class="highlight"><pre><span></span>destination1 | {root}/source1
</pre></div>
</div>
<p>The <code class="docutils literal notranslate"><span class="pre">{root}</span></code> in the instruction file would be string formatted using <code class="docutils literal notranslate"><span class="pre">paths</span></code>.
Therefore, the function would parse the instruction as:</p>
<div class="highlight-md notranslate"><div class="highlight"><pre><span></span>destination1 | /User/root/source1
</pre></div>
</div>
<p class="rubric">Example</p>
<p>The following code would use instruction files <code class="docutils literal notranslate"><span class="pre">file1</span></code> and <code class="docutils literal notranslate"><span class="pre">file2</span></code> to create symbolic links.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">link_externals</span><span class="p">(</span><span class="n">paths</span><span class="p">,</span> <span class="p">[</span><span class="s1">&#39;file1&#39;</span><span class="p">,</span> <span class="s1">&#39;file2&#39;</span><span class="p">])</span>
</pre></div>
</div>
<p>Suppose instruction file <code class="docutils literal notranslate"><span class="pre">file1</span></code> contained the following text.</p>
<div class="highlight-md notranslate"><div class="highlight"><pre><span></span>destination1 | source1
destination2 | source2
</pre></div>
</div>
<p>Symbolic links <code class="docutils literal notranslate"><span class="pre">destination1</span></code> and <code class="docutils literal notranslate"><span class="pre">destination1</span></code> would be created in directory <code class="docutils literal notranslate"><span class="pre">paths['external_dir']</span></code>.
Their targets would be <code class="docutils literal notranslate"><span class="pre">source1</span></code> and <code class="docutils literal notranslate"><span class="pre">source2</span></code>, respectively.</p>
<p class="rubric">Example</p>
<p>Suppose you have the following targets.</p>
<div class="highlight-md notranslate"><div class="highlight"><pre><span></span>source1
source2
source3
</pre></div>
</div>
<p>Specifying <code class="docutils literal notranslate"><span class="pre">destination*</span> <span class="pre">|</span> <span class="pre">source*</span></code> in one of your instruction files would
create the following symbolic links in <code class="docutils literal notranslate"><span class="pre">paths['external_dir']</span></code>.</p>
<div class="highlight-md notranslate"><div class="highlight"><pre><span></span>destination1
destination2
destination3
</pre></div>
</div>
</dd></dl>

</section>


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